Worksheet 448 · Skill 5

Set and drift

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1. At 1510 your fix is 089°T, 2.8 nm from Westfield church spire. You steer 096°T at 5.5 kn through the water. At 1600 a new fix puts you 229°T, 2.2 nm from Tern Island tower.

   Plot the 1600 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1410 your fix is 103°T, 1.2 nm from Westfield church spire. You steer 129°T at 5.3 kn through the water. At 1440 a new fix puts you 072°T, 1.1 nm from Heron Point Light.

   Plot the 1440 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1340 your fix is 071°T, 4.0 nm from Tern Island tower. You steer 191°T at 7.2 kn through the water. At 1415 a new fix puts you 346°T, 1.3 nm from Kittle water tank.

   Plot the 1415 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1110 your fix is 066°T, 2.7 nm from Gannet Rock daybeacon. You steer 338°T at 6.8 kn through the water. At 1140 a new fix puts you 055°T, 3.3 nm from Tern Island tower.

   Plot the 1140 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1450 your fix is 025°T, 2.7 nm from Heron Point Light. You steer 135°T at 5.6 kn through the water. At 1540 a new fix puts you 322°T, 1.7 nm from Mill stack.

   Plot the 1540 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0900 your fix is 227°T, 1.8 nm from Tern Island tower. You steer 117°T at 5.1 kn through the water. At 0935 a new fix puts you 145°T, 2.6 nm from Tern Island tower.

   Plot the 0935 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0725 your fix is 222°T, 1.8 nm from Tern Island tower. You steer 227°T at 4.2 kn through the water. At 0805 a new fix puts you 216°T, 3.4 nm from Tern Island tower.

   Plot the 0805 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1350 your fix is 063°T, 5.3 nm from Tern Island tower. You steer 180°T at 5.5 kn through the water. At 1430 a new fix puts you 046°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 1430 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn